Tunable Broadband THz Waveband Absorbers Based On Graphene for Digital Coding
1
Hunan Key Laboratory of Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China
2
Center of Material Science, National University of Defense Technology, Changsha 410073, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1844; https://doi.org/10.3390/nano10091844
Received: 15 August 2020
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Revised: 2 September 2020
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Accepted: 9 September 2020
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Published: 15 September 2020
A method of coding patterns is proposed to achieve flexible control of absorption response at terahertz frequencies. The designed absorber consists of an Au-graphene pattern layer, a SiO2 layer and a metal reflective layer. Among them, we use concentrical circle structure to achieve broadband absorption, and adjust graphene’s Fermi level to achieve tunable absorption. In addition, we propose an encoding method that can achieve flexible control of the absorption response at the terahertz frequency based on the external voltage applied on the graphene membrane, thereby having a programmable function. We also use COMSOL to simulate the electric field distribution diagram to explain the underlying physical mechanism. The programmable broadband adjustable absorber proposed in this paper has potential application prospects in the fields of optical equipment, information transmission, digital coding and artificial intelligence (AI).
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Keywords:
tunable; broadband; digital coding
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MDPI and ACS Style
Yang, H.; Chen, D.; Mao, Y.; Yang, J. Tunable Broadband THz Waveband Absorbers Based On Graphene for Digital Coding. Nanomaterials 2020, 10, 1844. https://doi.org/10.3390/nano10091844
AMA Style
Yang H, Chen D, Mao Y, Yang J. Tunable Broadband THz Waveband Absorbers Based On Graphene for Digital Coding. Nanomaterials. 2020; 10(9):1844. https://doi.org/10.3390/nano10091844
Chicago/Turabian StyleYang, Huiping, Dingbo Chen, Yuliang Mao, and Junbo Yang. 2020. "Tunable Broadband THz Waveband Absorbers Based On Graphene for Digital Coding" Nanomaterials 10, no. 9: 1844. https://doi.org/10.3390/nano10091844
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